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Proprietary base-metals supply-chain price and contract-term series maintained by an editorial desk: copper concentrate treatment/refining charge (TC/RC) observations including negative spot levels, quarterly and annual benchmark settlement outcomes, regional spot sulfuric acid price series (Chinese acid shown up roughly fivefold over 2.5 years), unroasted pyrite import volumes (~392,000 t in the first four months of 2026, highest for that period since 2014), and concentrate feedstock composition/impurity commentary (sulfur and iron content, acid-plant stress, slag and copper-loss penalties).
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